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Beaconspot S/N reporting
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I've just placed a Beacospot for GB3MHZ (1296MHz), and I note that the entry form now allows a S/N report, as well as RST and JT. Quotting S/N alone is meaningless - what bandwidth are people supposed to report it in? 1Hz, 300HzH, 2500Hz ? The text shown implies a negative sign means JT type reports relative to 2.5lkHz, but my report was +3dB (2500Hz) which is going to be ambiguous. A spot below mine, that from PA0JME, is listed as +25dB - which is almost certainly not in 2500Hz! What bandwidth has he used? What is intended by the S/N ? Andy
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Iain Young
I can't comment on what is intended, but I always try and add my
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bandwidth (which is usually 250k as I'm doing SDR) to the comments field Iain.
On 02/10/2022 12:58, Andy G4JNT wrote:
I've just placed a Beacospot for GB3MHZ (1296MHz), and I note that the entry form now allows a S/N report, as well as RST and JT.
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NO not that bandwidth. To specify the S/N you need to specify the noise bandwidth. If that's read from an FFT screen then it is usually equal to a couple or up to 3 FFT bins. So if you have a sampling rate of, perhaps 300kHz (for your 250k screen width) and an FFT of 65536 points then your noise bandwidth is ~ 5Hz. The exact number of bins depends on teh FFT window type in use Andy
On Sun, 2 Oct 2022 at 16:36, Iain Young <g7iii@...> wrote: I can't comment on what is intended, but I always try and add my
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alwyn.seeds1
Dear Andy,
I thought the standard for beacon reporting was an equivalent noise bandwidth of 2.5 kHz? On beaconspot it says "S/N report is in 2.5kHz bandwidth”. So, I report accordingly. As you say, SDR displays often do not make the bandwidth clear. I even see spectrum analysers where you have to dig through menus to find the resolution bandwidth. Regards, Alwyn G8DOH _____________________________________________________ Alwyn Seeds, Director SynOptika Ltd., 114 Beaufort Street, London, SW3 6BU, England. SynOptika Ltd., Registered in England and Wales: No. 04606737 Registered Office: 114 Beaufort Street, London, SW3 6BU, United Kingdom. _____________________________________________________
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Oops I didn't spot the line just below that states just that :-( :-( :-( I just saw : "RST(e.g. 599) OR S/N in dB(e.g. +30) OR JT65 (e.g. -13) :" and didn't read any further  Andy
On Mon, 3 Oct 2022 at 10:05, alwyn.seeds1 <a.seeds@...> wrote:
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